Well it depends what you enjoy more because from the sound of it they're 2 completely different products. Do you like flying in flightsim or do you prefer to play games like Airline Management. I don't know what the airline management game is like cause I've never played it (in fact I've never heard of it) but I can recommend the Overland Airbus package. If you do a lot of FS flying, in particular airbus models then go for it Lot's of liveries to add on and they look great too.
2 entirely different packages you've quoted there.
I have the Overland Airbus and Boeing packages, the models in both are very good but the FDE in the Airbus package is pants. However, all is not lost, some kind sole has re-done these and posted them on AVSIM. So if you get the Airbus package and download the modified FDE's, you should be very happy.